Changing step values in seekbar?

I have a seekbar, while moving it I want to change values from 0 to 200. I have a开发者_高级运维 TextView, where I display those values while moving the seekbar. But I don't want to have every value from that interval(0,1,2,3,4,5...), but to have 10, 20, 30...so on. So when I move the seekbar, I want to display 10,20,30,40....to 200. Can somebody give me a hint or an example how to do this?

Try below code

SeekBar seekBar = (SeekBar)layout.findViewById(R.id.seekbar);
seekBar.setProgress(0);
seekBar.incrementProgressBy(10);
seekBar.setMax(200);
TextView seekBarValue = (TextView)layout.findViewById(R.id.seekbarvalue);
seekBarValue.setText(tvRadius.getText().toString().trim());

seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener(){

    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        progress = progress / 10;
        progress = progress * 10;
        seekBarValue.setText(String.valueOf(progress));
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {

    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {

    }
});

setProgress(int) is used to set starting value of the seek bar

setMax(int) is used to set maximum value of seek bar

If you want to set boundaries of the seekbar then you can check the progressbar value in the onProgressChanged method. If the progress is less than or greater than the boundary then you can set the progress to the boundary you defined.

You can use the Slider provided by the Material Components Library using the android:stepSize attribute:

    <com.google.android.material.slider.Slider
        android:valueFrom="0"
        android:valueTo="200"
        android:stepSize="10"
       ..>

The easieset way I can think of, is simply defining:

SeekBar yourSeekBar = (SeekBar)findViewById(R.id.yourSeekBarId);
yourSeekbar.setMax(20);

Next, override those methods (the empty methods are also required, even if they are empty):

yourSeekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {          
        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {

        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {

        }

        @Override
        public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
            if (fromUser) {
                if (progress >= 0 && progress <= sizeSeekBar.getMax()) {                        

                    String progressString = String.valueOf(progress * 10);
                    yourTextView.setText(progressString); // the TextView Reference
                    seekBar.setSecondaryProgress(progress);
                }
            }

        }
    });

The idea is to only define 20 values for the seekbar, but always multiply the value by 10 and display that value. If you do not really need 200 values, then there is no point in using 200 values.

You should use the SeekBar.OnSeekBarChangeListener for tracking the progress change. Call mseek.setMax(200). Do a modulo operation on the current value to decide if the textview should be updated or not.

SeekBar.OnSeekBarChangeListener() {

    void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        if (progress % 10 == 0) {
            textview.setText(""+progress);
        }
    }
}

You can also achieve this by defining custom SeekBar class as below

public class CustomSeekBar extends AppCompatSeekBar {


int SEEKBAR_MULTIPLIER = 1;

public CustomSeekBar(Context context) {
    super(context);
}

public CustomSeekBar(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public CustomSeekBar(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
}

public void setSeekBarConfig( int SEEKBAR_MULTIPLIER, int SEEKBAR_MAX){
    setMax(SEEKBAR_MAX);
    this.SEEKBAR_MULTIPLIER = SEEKBAR_MULTIPLIER;
}

@Override
public int getProgress() {
    return super.getProgress() * SEEKBAR_MULTIPLIER;
}
}

And can use by following manner

 CustomSeekBar mCustomSeekBar = (CustomSeekBar) findViewById(R.id.customSeekBar);
 mSeekBar.setSeekBarConfig(10,20);

In xml you should add CustomSeekBar instead of SeekBar

<*.CustomSeekBar
    com.quemb.qmbform.view:setSeekBarConfig="10"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/seekBar" />

So that you can reuse the custom seekBar in entire App with out repeating whole extra calculation.

for the minimum issue, you can set an offset on your progress. This way, the user can't go under your minimal value.

int offset = 10;

seekBar seekBar = (SeekBar)layout.findViewById(R.id.seekbar);
seekBar.setProgress(0);
seekBar.setMax(190); //with the offset, you need to adapt the max value
TextView seekBarValue = (TextView)layout.findViewById(R.id.seekbarvalue);
seekBarValue.setText(""+(seekBar.getProgress() + offset));

seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener(){

    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        progress += offset;

        seekBarValue.setText(String.valueOf(progress));
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {

    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {

    }
});

use Math.round function

fun round(n: Int): Int {
    // Smaller multiple
    val a = n / 10 * 10
    // Larger multiple
    val b = a + 10
    // Return of closest of two
    return if (n - a > b - n) b else a
}

One possible solution would be to set seekBar.setMax(20) (or android:max="20" in XML), and whenever you use or display the value, multiply it by 10.

The SeekBar would then appear to move at least 20 at a time.